diff --git a/partner-datacell.js b/partner-datacell.js
index cdbcd53..caa67a6 100644
--- a/partner-datacell.js
+++ b/partner-datacell.js
@@ -163,9 +163,14 @@ function parseSN(message) {
     }
     
     var result = results[0];
-    result = result.replace('SN Operator:');
-    result = result.replace('SN Kami');
+    result = result.replace('SN Operator:', '');
+    result = result.replace('SN Kami', '');
     result = result.trim();
+    
+    if (result == '00') {
+        result = '';
+    }
+    
     return result;
 }